LAN9312 datasheet(233/458 Pages) SMSC

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High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface

Datasheet

SMSC LAN9312

233

Revision 1.2 (04-08-08)

DATASHEET

14.2.6.3

Port 0(Host MAC) Manual Flow Control Register (MANUAL_FC_MII)

This read/write register allows for the manual configuration of the switch Port 0(Host MAC) flow control.

This register also provides read back of the currently enabled flow control settings, whether set

manually or Auto-Negotiated. Refer to Section 6.2.3, "Flow Control Enable Logic," on page 58 for

additional information.

Note:

The flow control values in the Section 14.2.8.5, "Virtual PHY Auto-Negotiation Advertisement

Offset:

1A8h

Size:

32 bits

BITS

DESCRIPTION

TYPE

DEFAULT

31:8

RESERVED

Port 0 Hard-wired Flow Control (HW_FC_MII)

When set to “1”, the Host MACs RX FIFO level is connected to the switch

engine’s transmitter and the switch engines RX FIFO level is connected to

the Host MACs transmitter. This achieves lower latency flow control.

Note:

All other flow control methods must be disabled when using this

feature. (MANUAL_FC_MII should be set, TX_FC_MII,

RX_FC_MII, and BP_EN_MII should be cleared. FCANY, FCADD,

FCBRD, and FCMULT in the AFC_CFG register should be

cleared).

R/W

Port 0 Backpressure Enable (BP_EN_MII)

This bit enables/disables the generation of half-duplex backpressure on

switch Port 0.

0: Disable backpressure

1: Enable backpressure

R/W

Note 14.12

Port 0 Current Duplex (CUR_DUP_MII)

This bit indicates the actual duplex setting of the switch Port 0.

0: Full-Duplex

1: Half-Duplex

Note 14.13

Port 0 Current Receive Flow Control Enable (CUR_RX_FC_MII)

This bit indicates the actual receive flow setting of switch Port 0

0: Flow control receive is currently disabled

1: Flow control receive is currently enabled

Note 14.13

Port 0 Current Transmit Flow Control Enable (CUR_TX_FC_MII)

This bit indicates the actual transmit flow setting of switch Port 0.

0: Flow control transmit is currently disabled

1: Flow control transmit is currently enabled

Note 14.13

Port 0 Receive Flow Control Enable (RX_FC_MII)

When the MANUAL_FC_MII bit is set, or Virtual Auto-Negotiation is

disabled, this bit enables/disables the detection of full-duplex Pause packets

on switch Port 0.

0: Disable flow control receive

1: Enable flow control receive

R/W

Note 14.14

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